RuO2 nanoparticles were supported on arc-black (AB) with different pH of Ru colloidal solutions. For lower pH, RuO2 particles in nanometer size were dispersed on AB, although for higher pH, RuO2 particles were aggregated. The RuO2-supported-AB prepared at pH 5 had the highest amount of RuO2 and showed the highest capacitance.
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